My sense in talking to a bunch of CO natives over the past few years is that the things that are missing are some big early and more late winter/spring upslope events they remember from when they were growing up. May-June used to be reliably greener, according to a PhD I know who is now in his 70s. The past few March/Aprils have not been real wet generally, Junes have been very hot, and Halloween, which was formerly an adventure in freezing one's butt off underneath one's costume, is a much milder affair than days of yore. Let's see what the next couple months bring... we could be pleasantly surprised.
Historically, it's interesting when you think about when the Front Range was first settled by those from the Eastern US about 100-130 years ago. Water booms and busts are normal, with busts more common. A wet few decades lured many to the area, then the Dust Bowl jarred everyone back to reality.
Of course, if you go to the New England board, you'd think they expect an epic blizzard every 10 days between Thanksgiving and Easter. It really was NOT like that in the 1970s other than a few memorable events.